Dizziness and Fatigue They are also known as early depression symptoms leading to: dizziness, lightheadedness, slow thinking, lack of motivation, memory problems, mood swings and poor concentration. When the body is not adequately hydrated, organs, including the eyes, suffer. The body’s initial response to a loss of fluid is to preserve the amount of fluid in the body by conserving water, which can lead to dry eyes, eye strain and vision problems. If your eyes are feeling uncomfortable, your head will suffer from dizziness and migraines. What’s more, as water is a major component of our blood, if your blood gets thicker because of dehydration and you have been sitting for too long, most of your blood will move to your legs, causing an insufficient blood supply to your brain and then...